Boron has two stable isotopes, ${ }^{10} \mathrm{~B}(19 \%)$ and ${ }^{11} \mathrm{~B}(81 \%)$. Calc

Question

Boron has two stable isotopes, ${ }^{10} \mathrm{~B}(19 \%)$ and ${ }^{11} \mathrm{~B}(81 \%)$. Calculate average at. wt. of boron in the periodic table.\

Professor PC Thomas Classes · Answer

(a) : Average atomic mass $=\frac{19 	imes 10+81 	imes 11}{100}=10.81$\